问题补充：
(·高考四川卷)which university to attend，the girl asked her teacher for advice.
A. Not knowing
B. Knowing not
C. Not known
D. Known not
答案：
A. Not knowing
B. Knowing not
C. Not known
D. Known not
解析：选A。题干的意思是：女孩不知道上哪一所大学，就向老师寻求建议。句子主语the girl和动词know之间是主谓关系，所以应该用动词ing形式作状语，而动词ing形式的否定式是在其前加not，所以选A，从而排除B和表示动宾关系的C和D。
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